AirHint found the following cheapest return flights from Denver (DEN) to Dublin (DUB) in May 2026 (see full year).

Return flights

05 May - 12 May	Iberia
12 May - 21 May	Iberia
06 May - 13 May	Air Canada
09 May - 16 May	Icelandair
09 May - 15 May	Icelandair
18 May - 27 May	British Airways
04 May - 11 May	Aer Lingus	direct
14 May - 21 May	Icelandair
08 May - 23 May	Icelandair
15 May - 25 May	Air Canada
27 May - 20 Jun	SWISS
22 May - 13 Jun	Air Canada
22 May - 13 Jun	Aer Lingus	direct
27 May - 20 Jun	Aer Lingus	direct

Also check the deals for one-way flights from Denver to Dublin in May.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Denver to Dublin in May from $438

Return flights